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The quest for pretty atmospheres continues. Further tweaks to the atmosphere shader, hopefully we got it this time round.

master
AnotherCommander 2019-01-06 19:00:33 +01:00
parent 56dd34a059
commit 3dbfc6b472
1 changed files with 7 additions and 5 deletions
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12
Resources/Shaders/oolite-default-atmosphere.fragment
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@ -36,8 +36,8 @@ varying vec3 vLight1Vector;
const vec3 biasColor = vec3(0.0, 0.0, 1.0);
const vec3 kTerminatorThreshold = vec3(0.105, 0.18, 0.28); // old: vec3(0.1, 0.105, 0.12);
const float kFresnelExponent = 2.0;
const float biasColorMixRatio = 0.35;
const float kFresnelExponent = 4.0;
const float biasColorMixRatio = 0.1;
void main()
@ -63,7 +63,7 @@ void main()
// into the shader with a scale factor of 10
if (atmRadius <= 40000.0)
{
cosThreshold = 0.16; // 80.8 deg
cosThreshold = 0.17; // 80.21 deg
newOpacityExponent = 5.0;
}
@ -75,7 +75,9 @@ void main()
// get the fresnel lit up from the correct direction
vec3 invLight = vec3(dot(light1Vector, normal));
totalColor *= dot(normalize(fresnel), invLight) * mix(diffuseColor, biasColor, biasColorMixRatio);
totalColor *= dot(normalize(fresnel), invLight) *
mix(totalColor, biasColor, biasColorMixRatio) *
clamp(totalColor, vec3(0.0), diffuseColor);
// magic herebelow - painting the orange-reddish tinted terminator
totalColor *= smoothstep(vec3(0.0), kTerminatorThreshold, abs(vec3(light1Vector.z)));
@ -93,7 +95,7 @@ void main()
// calculate the final opacity, special handling for
// angles > arccos(cosThreshold) to fade atmosphere out at its edge
float newOpacity = quant * (NdotV > cosThreshold ?
length(fresnel) * cosThreshold / NdotV :
length(fresnel) * cosThreshold * 0.8 / NdotV :
pow(NdotV / cosThreshold, newOpacityExponent));
gl_FragColor = vec4(totalColor, newOpacity);